Spool



FIG. 1 is a perspective view of a spool, showing our new design.

FIG. 2 is a left side view thereof.

FIG. 3 is a rear view therof.

FIG. 4 is a right side view thereof.

FIG. 5 is a front view thereof; and,

FIG. 6 is a topview therof.

The broken lines showing environment in the drawings are forillustrative purposes only and form no part of the claimed design.

The ornamental design for a spool, as shown and described.